do not send frames when nothing changes

DisplayCommands/ByteGrid.cs

@@ -2,17 +2,17 @@ using System.Diagnostics;
 
 namespace DisplayCommands;
 
-public class ByteGrid(ushort width, ushort height)
+public sealed class ByteGrid(ushort width, ushort height) : IEquatable<ByteGrid>
 {
     public ushort Height { get; } = height;
-    
+
     public ushort Width { get; } = width;
-    
+
     internal Memory<byte> Data { get; } = new byte[width * height].AsMemory();
 
     public byte this[ushort x, ushort y]
     {
-        get => Data.Span[ GetIndex(x, y)];
+        get => Data.Span[GetIndex(x, y)];
         set => Data.Span[GetIndex(x, y)] = value;
     }
 
@@ -24,4 +24,16 @@ public class ByteGrid(ushort width, ushort height)
     }
 
     public void Clear() => Data.Span.Clear();
-}
+
+    public bool Equals(ByteGrid? other)
+    {
+        if (ReferenceEquals(null, other)) return false;
+        if (ReferenceEquals(this, other)) return true;
+        return Height == other.Height && Width == other.Width && Data.Span.SequenceEqual(other.Data.Span);
+    }
+
+    public override bool Equals(object? obj) => ReferenceEquals(this, obj) || (obj is ByteGrid other && Equals(other));
+    public override int GetHashCode() => HashCode.Combine(Height, Width, Data);
+    public static bool operator ==(ByteGrid? left, ByteGrid? right) => Equals(left, right);
+    public static bool operator !=(ByteGrid? left, ByteGrid? right) => !Equals(left, right);
+}